How the Nervous System Works

Chris Regal | April 18, 2012

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The Central Nervous System is composed of the brain and spinal cord.
  1. 1 True
  2. 0 False
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The nervous system is organized into two parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS is composed of the brain and spinal cord. The PNS is made up of nerves that extend from the brain and the spinal cord.

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  1. The Central Nervous System is composed of the brain and spinal cord.

    Correct Answer: True

    The nervous system is organized into two parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS is composed of the brain and spinal cord. The PNS is made up of nerves that extend from the brain and the spinal cord.

  2. The Peripheral Nervous System sends signals to our voluntary muscles which allow us to move and take care of our needs.

    Correct Answer: False

    The CNS sends signals to our voluntary muscles. The nerves and receptors of the PNS carry out these signals by transmitting them to our muslces which then act out the signal.

  3. Axons are the "information super highway" of the nervous system. They transmit messages over substantial distances within the body.

    Correct Answer: True

    Axons carry important messages from our brain to the necessary body part so that our muscles and limbs perform the necessary action.

  4. Myelin prohibits nervous system signals from traveling too far down an axon.

    Correct Answer: False

    The myelin sheath is a phospholipid substance that insulates axons and increases the speed of transmission of messages in the nervous system.

  5. MS gradually destroys myelin sheaths in the CNS impeding the conduction of nerve impulses.

    Correct Answer: True

    MS gradually destroys the myelin sheaths covering axons in the nervous system. Eventually the damage leads to nonfunctional hardened lesions called scleroses that impede or prohibit the transmission of nervous system signals.